"The only thing more surprising than a fully functioning chocolate factory smack dab in the middle of San Francisco is the fact that it's one of the few in the world that actually makes chocolate from scratch. They're kind of chocolate purists in that they don't do fancy flavors but rather rely on really good bean varieties and just a smidge of sugar (every bar has 70% chocolate to 30% sugar). Buy all sorts of fresh-baked, chocolate-spiked pastries and sample all the house varieties at the on-site café. Call ahead to request a guided tour of the factory. "